I found exactly what I was looking for at Plastic Care Inc. Thanks Dave!
Picking up a piece of of 55x12 plexiglass tomorrow for $23. Hoping I can just cut it to shape with a Dremel Tool. Now I just have to fab some brackets....

Plexiglass as in Acrylic? That won't hold up too well. The UV will yellow it, it will develop lots of small micro cracks which lead to a big crack. Lexan (polycarbonate) would hold up better is you want something clear. Black ABS would be the best.